﻿/*
Copyright (c) 2013, Marc Tanti
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
* Neither the name of the www.marctanti.com nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using MARIA.level.robot;
using MARIA.level.direction;
using System.Windows.Forms;
using MARIA.program.statement.statementtype;
using MARIA.program.condition;
using MARIA.program.statementfactory;
using System.Runtime.Serialization;

namespace MARIA.program.statement
{
    [Serializable]
    /// <summary>
    /// Statement to make the robot do something conditionally.
    /// </summary>
    public class ChoiceStatement : Statement, IChoice
    {

        public Condition ConditionUsed
        {
            get
            {
                return condition;
            }
        }
        private Condition condition;

        /// <summary>
        /// Initialize a new instance of IfStatement.
        /// </summary>
        public ChoiceStatement(Condition condition)
            : base()
        {
            this.condition = condition;
            Text = "CHOICE IF " + condition.TextualDescription();
            condition.OnConditionChanged += new Condition.ConditionChangedHandler(condition_OnConditionChanged);
        }

        public ChoiceStatement()
            : this(new Condition())
        {
        }

        public ChoiceStatement(SerializationInfo info, StreamingContext context)
            : base(info, context)
        {
            condition = (Condition)info.GetValue("condition", typeof(Condition));
        }
        protected override void Serialize(SerializationInfo si, StreamingContext context)
        {
            base.Serialize(si, context);
            si.AddValue("condition", condition);
        }

        public override StatementFactory GetFactory()
        {
            return ChoiceFactory.Instance;
        }

        private void condition_OnConditionChanged(object sender, ConditionChangedEventArgs args)
        {
            Text = "CHOICE IF " + condition.TextualDescription();
        }

        /// <summary>
        /// Check if a statement can be made a child of this statement.
        /// </summary>
        /// <param name="child">The statement to add.</param>
        /// <returns>Whether the statement is a control statement or not.</returns>
        public override bool CanAdd(Statement child)
        {
            return child is IControlStatement;
        }

        /// <summary>
        /// Check if a child statement can be removed from this statement.
        /// </summary>
        /// <param name="child">The statement to remove.</param>
        /// <returns>Always true.</returns>
        public override bool CanRemove(Statement child)
        {
            return true;
        }

        /// <summary>
        /// Make the robot see what is in a particular direction and modify the control flow accordingly.
        /// </summary>
        /// <param name="robot">The robot to manipulate.</param>
        /// <param name="statementStack">The statement stack.</param>
        public override void Execute(Robot robot, Stack<Statement> statementStack)
        {
            if (condition.TestCondition(robot) && FirstNode != null)
            {
                statementStack.Push((Statement)FirstNode);
            }
        }

        /// <summary>
        /// Set up the editor panel to enable the user to edit this statement.
        /// </summary>
        /// <param name="p">The editor panel.</param>
        public override void SetEditPanel(Panel p)
        {
            condition.SetEditPanel(p);
        }

        public bool CheckCondition(Robot robot)
        {
            return condition.TestCondition(robot);
        }

    }
}
